Possible reasons for the automatic transmission jerking when the speed is turned on:
1. Low or dirty gear oil level:
* Transmission oil provides lubrication and hydraulic control of the transmission. Insufficient or contaminated oil can cause slipping or jerking when shifting.
2. Worn or damaged friction linings:
* Friction linings located in the gearbox provide engagement between the shafts. Worn or damaged friction linings can cause slipping and jerking.
3. Faulty solenoids:
*Solenoids are solenoid valves that control the flow of transmission oil inside the transmission. Faulty solenoids can result in rough shifting or jerking.
4. Failure of the hydraulic unit:
* The valve body is the heart of the automatic transmission. It contains passages, valves and sensors that control transmission oil flow and gear shifting. A faulty valve body can cause a variety of problems, including shifting jerkiness.
5. Problems with the electronic control unit (ECU):
* The ECU is the computer that controls the automatic transmission. A faulty ECU may send incorrect signals, resulting in incorrect shifting and jerking.
6. Worn or faulty speed sensors:
* Speed sensors provide information about the speed of rotation of the vehicle’s shafts and wheels. Faulty sensors can lead to erratic gear shifting and jerking.
7. Worn or faulty torque converter:
* The torque converter connects the engine to the transmission. A faulty torque converter can cause slipping and jerking when shifting gears.